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Any ATM at a location that can get a phone line or an internet connection can get a private data line, and many did as early as the 1970's. There may be a business case that an internet connection or a phone line is more economical, net of losses to hacking; but a private data line is technically feasible anywhere that any wired connection to a public network is available

Sure, it's feasible. At roughly 20x-25x the cost. Your local gas station and mini mart would never have an ATM if they needed more than a simple connection. As as you even point out, it takes nothing more than a VPN tunnel to secure an internet connection, a private data line is very close to useless.
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